Tool for air brakes



R. G. P. RlTHlE TOOL FOR AIR BRAKES Filed Feb. 2, 1927 Feb. 14, 192s. V`1,559,006-

` .a Maw 7 Aitornf;

Patented Feb. 14, 1928.1LAV

UNITE-D Fics.

ROBERT GRAHAM PATERsoN aimez-iin, or NiAGaRii FALLS, ONTARIO, cANnA;

Toon ron AI'RB'RAKEs ppncenonfne'a*February 2, i927., seriai No. 165,448.

{The invention relates to'improvements in tools for airbrakesjas described in the present speciiication and shown in the Vaccompanying drawings which forinpart ofthe i same. Y, e f

Whilst the usual to remove the non-'pressure head so that the piston can be taken out of the cylinder together with its accompanying parts; In removing the non-pressure head,fhowever, it is ldesirable to lirst lock it to thevk piston sleeve so that there will'beno pressure upon its bolts yat the time they are*V being unscrewed and also -4tokeep the non-pressure head, piston and sleeve assembled as a `runit so as to facilitate cleaning andl inspection. Ii? these 'parts are not `locked 'together as a unit it'will he readily apparent that'the piston spring will kforce the non-pressureliead violently ofil the sleeve endangering the inspector and, furthermore,- inalring it diiicult to reassembletlie structure.

Itis therefore the object oi'f the present inventionV to providev a simple and useful tool which can be inserted in. the hollow piston sleeve and looked to the` same by fingers whichv t-he ldevice yieldably carries. It also bears' an adjustable shoulder for screwing against the non-pressure head to ycounteract pressure of the piston spring. By thus locking thefparts together it is a simple matter to eiiect their removal and rel placement without in any way disturbing their relationship. l

The invention consists essentially of a tool for insertion in the piston sleeve having retractile fingers tor engaging apertures in the end thereof and bearing a screw threaded ring for adjustably engaging the nonpressure head.r

Referring to the drawings, Figure l is an elevation partly in section of an airbralze showing the invention applied thereto. Figure 2 is a vertical sectional view through the invention. Figure Bis a cross sectional View taken on the line 33 ot Figure 2. Figure 4e is a further sectional view showingv a slightly modified form ot' the present y inventionappertains more pari ticularly to airbrakes for railway engines,

invention. `Figure 5 is a l'cros's.; sectiorial view thereotaken on the line 5%51of Figure4.- y, e', 'j

Like numerals of reference indicateicorresponding parts in leach' ofgtheliigures.

throughout the drawings. l e

In Figure 1, the numeral 10 designatesthe airbralre cylinderlwliich is connected,to the air reservoir 11 at one endandfto "the non-pressure head L1L) at the other end, the

connectioirof the' 'non-pressure head beingy el'ected Aby series of boltslfpa'ssing through the abutting ilanges'lfl. n

, 15, is the piston, withk its accompanying sleevel about which isktlie helical coing ypression spring 17y which is. shouldered against that piston at `^oney fendandat the other end against t-lie nonpressure head thus yexerting pressure against this'latter membertendingfto Atorce it: oli; the cylinder. The sleeve carries the usual apertures 18 in fits rear end. y e. e "f I j Having iiow recounted 4, the airb'rake 'construction the inventionitself will' be described.L 19 isjasliell iorfinsertion `infthe sleeve yotgthepiston andrecessed `at 20 to receive the end thereof, thus providing' an annulus y21v of greatei"sdiameter kthan the sleeve, ywhich passes 'thereoveri X This yannulus is screw'threaded to engage a ring-22;' y

Extended lengthwise of thershell isa pair ot lingers'v 23 whichare pivota'lly secured `thereto as at 24e at theiifrear endsand terminste at their forward ends in linger ygrips 25. Integral with eachv finger :isa detent Q6 ywhichprojects through an `aperture 27 in the shell so as to pass therethrough and enter an aperture 18 in the sleeve. 27a is a helical compression spring havin@ its ends shouldered against the pilots carrledby the nngers so as to yieldably hold'them in a projected position as clearly discernible'in Figure 2. In the use of this tool the finger grips 25 are pressed together so asto withdraw the detents 26 sutiiciently to permit of the shell being inserted iii theV sleeve 16, then the lingers are released permitting the detents to enter theV apertures 1S thereof. The ring 22 is then screwed sok as to press against the noii-pressure head to Vsecurely lock the same to the piston sleeve. llVith these units securely locked together it is a simple matter to remove and replace the head for cleaning and inspection. e yIn the inodiiied ormshown in Figures 4 and 5, theonly diii'erence which exists is that the lingers 23 carry integral members 28 converting them into bell cranks. These members 28 engage a block 29 by means ot' pins 30 operating in the slots of the block. Projecting centrally ofthe shell is a screw 3l which passes through the block and is shouldered against the sides thereof. lts threads 82 engage a bridge 33 carried by the shell While the free end of the screw is squared.l as at 34 to receive a Spanner er other turning key.

To operate the fingers by this modied form of construction it is simply necessary to turn the screw 3l so as to advance it .and cause the block 29 to rotate the members 28 suficiently to retract the detents 26. To

kengage the detents 26 in the apertures 18 of the sleeve the screw 34 is turned in the opposite direction. It Will be observed that the tivo forms shown of this invention differ in that one provides a positive and the other a negative finger operated mechanism.

What l claim is Y g l. A tool for an airbrale, comprising a shell, fingers carried thereby for Ventering apertures in the airbralre sleeve and means borne by the shell for engaging the nonpressure head. n

2. A tool for an airbralre, comprising a shell, fingers yieldably carried thereby for entering apertures in the airbrake sleeve and means lborne by the shell for engaging the non-pressure head.

3. A. tool for an airbrake, comprising a shell, fingers carried thereby for entering apertures in the airbrake sleeve and a ring adjustably fitted onto the shell for engaging the non-pressure head.

yfr tool for an airbrake, comprising a shell for insertion in the piston sleeve, retractile fingers carried by the shell for en gaging sleeve apertures, and an adjustable member borne by said shell for shouldering against the non-pressure head.

5. A tool for an` airbrake, comprising a shell for insertion in the piston sleeve, fingers pivoted to the shell, detents extending from the fingers for engaging sleeve apertures, means Jror actuating said fingers, and a member borne by said shell for shouldering against the non-pressure head.

6. A tool for an airbrake, comprising a shell for insertion in the piston sleeve, fingers pivoted to the shell, projections borne thereby tor engaging sleeve apertures, means for actuating .said fingers, and a member borne by said shell for shouldering. against the non-pressure head.

7. A tool for an airbralre, comprising a shell for insertion in the piston sleeve, lingers pivoted to the shell, detents extending from the fingers for engaging sleeve apertures, and screw mechanism for actuating said fingers.

8. A tool for an airbrake, comprising a shell for insertion in the piston sleeve, fin gers pivoted to the shell, detents extending from the lingers for engaging sleeve apertures, a screw threadedly supported by the shell, .a block actuated by the screw and a connection extending between the block and the aforesaid fingers.

9. A tool for an airbrake, comprising a shell for insertion in the piston sleeve, ngers pivoted to the shell, detents extending from the fingers for engaging sleeve apertures, a screfv threadedly Supported by the shell for .axial movement, a blockshouldered upon thescreW, members pinned to the block and rigidly extending from the aforesaid fingers.

lO. A tool for an airbrake, comprising a shell, fingers carried thereby for entering apertures in the airbrake sleeve and a ring threadedly engaged with the shell for abutting the non-pressure head.

Signed at Niagara Falls, Ontario, Canada, the 26 day of January, 1927.

ROBERT GRAHAM PATERSDN RHTCHIE. 

